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Heat shrinkage copolyester film and preparation method thereof

A technology of copolyester and heat shrinkage, which is applied in the field of highly transparent three-layer co-extrusion copolyester heat shrinkable film and its preparation, can solve the problems of unsatisfactory tensile strength, shrinkage uniformity and toughness, etc., and achieve excellent transparency , Uniform shrinkage and strong stability

Active Publication Date: 2013-07-17
JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the film described in the invention has good light transmittance, its tensile strength, shrinkage uniformity and toughness are not ideal.

Method used

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  • Heat shrinkage copolyester film and preparation method thereof
  • Heat shrinkage copolyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 5.0Kg of purified terephthalic acid, 2.2Kg of ethylene glycol, 1.8Kg of 1,4-cyclohexanedimethanol (CHDM), 0.1g of ethylene glycol antimony catalyst, and 100g of calcium carbonate in a 20L general-purpose reactor Additive, 10g of nano-scale calcium acetate additive, carry out esterification reaction under the conditions of 230-250°C and 0.2-0.3Mpa, and release the system pressure to normal pressure after the water output reaches the theoretical value. React under these conditions, add 0.03g triethyl phosphate stabilizer, stir at normal pressure for 6min, after vacuuming, raise the temperature inside the reactor to 285°C, and drop the pressure below 100Pa, react under these conditions for 3h, and finally PETG copolyester chips for films with an intrinsic viscosity of 0.75 dl / g were obtained through polymerization melt extrusion, pelletizing and drying.

[0029] Add 3.5KgPET prepolymer (esterified product of purified terephthalic acid and ethylene glycol) and 2.5KgPBT ...

Embodiment 2

[0033] Add 5.0Kg of purified terephthalic acid, 2.4Kg of ethylene glycol, 1.6Kg of 1,4-cyclohexanedimethanol (CHDM), 0.1g of tetrabutyl titanate catalyst, and 120g of calcium acetate anti-sticking into a 20L general-purpose reactor Binder, 20g nano-scale calcium acetate additive, carry out esterification reaction under the conditions of 230-250°C and 0.2-0.3Mpa, and release the system pressure to normal pressure after the water output reaches the theoretical value. React under these conditions, add 0.03g triethyl phosphate stabilizer, stir at normal pressure for 6min, after vacuuming, raise the temperature inside the reactor to 285°C, and drop the pressure below 100Pa, react under these conditions for 3h, and finally PETG copolyester chips for films with an intrinsic viscosity of 0.80 dl / g were obtained through polymerization melt extrusion, pelletizing and drying.

[0034] Add 3.7KgPET prepolymer (esterified product of purified terephthalic acid and ethylene glycol) and 2.3Kg...

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Abstract

The invention discloses a heat shrinkage copolyester film and a preparation method thereof. The heat shrinkage copolyester film is characterized by comprising a surface layer A composed of PETG (polyethylene terephthalate glycol) copolyester, a core layer B composed of PET (polyethylene glycol terephthalate) / PBT (polybutylece terephthalate) copolyester and a bottom layer C composed of PCTG (di-n-octyl phthalate) copolyester. The film-used PETG copolyester slices, film-used PCTG copolyester slices and film-used PET / PBT copolyester slices are obtained through a screw extruder. Compared with regular heat shrinkage copolyester films, the three-layer co-extrusion lateral-stretching heat shrinkage copolyester film has the advantages that the three-layer co-extrusion lateral-stretching heat shrinkage copolyester film has high light transmittance and single hot-shrinkage rate, has good gloss and high stability, can be evenly shrunk, has good transparency, tractility and toughness, can be produced in the existing BOPET (polyester film) film production lines, and is suitable for direct packages of labels of various containers, food and beverage, electric products, machinery or hardware products.

Description

technical field [0001] The invention relates to a heat-shrinkable copolyester film and a preparation method thereof, in particular to a highly transparent three-layer co-extruded copolyester heat-shrinkable film and a preparation method thereof. Background technique [0002] In recent years, the domestic market has a great demand for high-grade heat-shrinkable films. Heat-shrinkable films based on polyvinyl chloride (PVC), polystyrene (PS) or polyethylene terephthalate (PET) have good shrinkage properties when heated, and the above products have been widely used in convenience foods and beverages, Direct packaging of machinery or hardware products. [0003] Since the heat-shrinkable polyvinyl chloride film often produces a large amount of hydrogen chloride and dioxin gas when it is incinerated, it is not conducive to recycling and does not meet environmental protection requirements. Therefore, its application is limited. [0004] Polystyrene heat-shrinkable film has good s...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/36B32B27/20C08G63/183C08G63/199C08G63/78C08G69/44C08L67/02C08L77/12B29C55/04B29C47/00
Inventor 吴培服
Owner JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
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